add documentation for NODE_ENV as an environment selector in CLI
add documentation for NODE_ENV as an environment selector in CLI

carragom/knex,carragom/knex,tgriesser/knex,statyan/knex,Atlantis-Software/knex,whitelynx/knex,harriha/knex,wubzz/knex,wubzz/knex,chuym/knex,joeframbach/knex,WaltRock/knex,vellotis/knex,abegines/knex,whitelynx/knex,maxcnunes/knex,maxcnunes/knex,WaltRock/knex,whitelynx/knex,vellotis/knex,tgriesser/knex,maxcnunes/knex,noodle/knex,Atlantis-Software/knex,harriha/knex,vellotis/knex,abegines/knex,chuym/knex,noodle/knex,harriha/knex,tgriesser/knex,chuym/knex,joeframbach/knex,joeframbach/knex,statyan/knex,CorvusCorrax/knex,CorvusCorrax/knex